Bbox

[rburghol]

@BrendanBrogan @COBrogan
I made some adjustments to allow a custom bbox to be passed in via the render args -- this can also form the basis for using the database for custom bbox which was planned, but I think not fully implemented. This facilitates the zoomed in views for these WSP availability inquiries.

I tagged you all because I may have broken things in my improvements, but also, because one thing that I ran into when testing this was that there was a global name search matching anything that had gg in it, in order to iterate through and create the HTML file with render errors transcript. That broke during my testing as there were remnants in memory and I had to clear my environment to actually run the markdown successfully.

Obviously searching the global namespace for possible maps is a fraught endeavor, and also a more robust way was already in place (using the list map_objects) but then commented out -- since it was commented out, I figured there must have been a good reason why. I couldn't guess why, but noticed that the GW critical cells maps were not added to the map_objects list, so I added them in case that was the reason. Or maybe this was just some remnant code that snuck back in due to a reversion.

Anyhow, if either of you know a good reason why we needed the global search in there, I wanted to give a heads up, and not just run ahead and merge this PR.